Joshua 3:5 is a command to prepare. Before the Israelites cross the flooded Jordan River, Joshua tells them to set themselves apart for God, because the LORD is about to do something remarkable among them the next day. The verse is spoken by Joshua, Israel’s new leader, to the whole nation camped on the east side of the river.
Joshua said to the people, “Sanctify yourselves; for tomorrow the LORD will do wonders among you.”
Joshua 3:5 (WEB)
What Joshua 3:5 Means
The word “sanctify” means to set apart, to make something belong to God and be ready to meet him. In the ancient Israelite setting this involved outward preparation such as washing clothes and keeping ritual purity, and it also involved an inner readiness to trust and obey. Joshua is not asking people to earn God’s help by good behavior. He is asking them to get their hearts and their household ready for a day they will not forget.
The phrase “tomorrow the LORD will do wonders” makes a promise about God’s action, not about a guaranteed outcome for every personal plan. The wonders refer to the miraculous stopping of the river, which the story reports in the verses that follow. The verse does not promise that every hard crossing in life will be dramatic, but it does tell us that God acts on behalf of his people at moments of his choosing.
The Context of Joshua 3:5
The book of Joshua is part of the historical books of the Old Testament, traditionally attributed to Joshua himself, though much of it was likely shaped and edited later. Its audience is the Israelite community entering the promised land after Moses’ death. The book continues the story begun in Deuteronomy, so readers who know that background will recognize the sense of transition and the need for a new generation to trust God.
The verses just before this one, in Joshua 3:2 to 3:4, describe the officers instructing the people to follow the ark of the covenant from a safe distance. The verses just after, 3:6 to 3:8, show Joshua directing the priests to step into the water and God promising to magnify Joshua in the sight of Israel. Read in that sequence, the call to sanctify is part of a larger act of ordered obedience, with God’s presence leading the way and the people responding in reverent trust.
Key Phrases in Joshua 3:5
Exodus 19:10
The LORD said to Moses, “Go to the people, and sanctify them today and tomorrow, and let them wash their garments…
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This verse records God telling Moses to have the people wash their clothes and prepare for his coming to Mount Sinai. It shows the same pattern of sanctification before a major encounter with God, which helps explain why Joshua gives a similar command at the Jordan.
Joshua 4:6-7
6 That this may be a sign among you, that when your children ask in the future, saying, ‘What do you mean by these stones?’ 7 then you shall tell them, ‘Because the waters of the Jordan were cut off before the ark of the LORD’s covenant. When it crossed over the Jordan, the waters of the Jordan were cut off. These stones shall be for a memorial to the children of Israel forever.’”
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These verses describe the memorial stones the people set up after crossing the river, so that future generations will ask about the event. They show that the wonders God does are meant to be remembered and told, which gives weight to the preparation called for in 3:5.
A Short Prayer From Joshua 3:5
Lord, you are the one who does wonders among your people, and I want to be ready for whatever you are doing in my life. Show me where I need to be cleansed, where my attention has drifted, and where I have been trying to manage things on my own. Help me set myself apart for you today, not to earn your help but to receive it with a open and trusting heart. Amen.
